Cattleya leaf problem black spot
 

One of my Cats was supplied with a nice damp black spot. I have treated it with peroxide and the spot has turned brown and dried out. However, the leaf is yellowing badly and some advice would be appreciated.

Hopefully the pic is good enough to see how bad it is.

I think you did the right thing.:) Was prolly some kind of acute bacterial issue on that one bulb. But, the rest of the plant looks lovely. Were I you, I would just remove that bulb.

At which point? At the point where the flower sheath emerges?

Well....at this point, I think, no need to sever it at rhizome level but the base already looks kinda yellow, tho that could owe to the peroxide. I would sever it just above the medium, and dust the open tissue with cinnamon or a fungicide.

Actually, I am more in favor, in such situations of scoring the diseased portion of the leaf with a sterile blade so the remedy can get into the tissue, and dusting with fungicide, rather than using peroxide....which is very caustic... altogether.

I truly think the puppy will be OK!!!!
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Edit: It might also not hurt to spray the whole plant with a fungicide solution, also, perhaps put the entire pot it in a container filled with such a solution (lukewarm) for a few mins. It will not hurt, and might well help prophylactically.

OK, so should I cut just above the first short section after the rhizome or in the middle of that? From the rhizome there is a short vertical, a medium vertical, then the large vertical, then the leaf.

I used peroxide as I thought it was a bacterial lesion I'll remember your tip tho if I get another.

Re the fungicide. I have a copper based one or one called Mancozeb which is a fairly serious weapon here. What would be your choice?

I would cut it maybe just under an inch above the medium with a sterile instrument. Say just at the first node. Just so you can monitor the progress of what remains.

OK, thanks.

My pleasure.....keep us informed!

Re the fungicide. I have a copper based one or one called Mancozeb which is a fairly serious weapon here. What would be your choice?

OK, so should I cut just above the first short section after the rhizome or in the middle of that? From the rhizome there is a short vertical, a medium vertical, then the large vertical, then the leaf.

I used peroxide as I thought it was a bacterial lesion I'll remember your tip tho if I get another.

Re the fungicide. I have a copper based one or one called Mancozeb which is a fairly serious weapon here. What would be your choice?[/QUOTE]


Believe it or not just plain cinnamon is very effective! The usual fungicide powders available for dilution as well....and flowers of sulphur. We must make sure the cures do no harm!

But for me, scoring the leaf tissue is important...for the purpose I shared.

Edit: sorry I put up the wrong pic.

OMG I need to slow down, I did it again, sorry!